The moment when audience members are invited to visit a website and watch a video on their smartphones, to accompany the narration, is a geeky idea that just seems to fit.

The use of the glass-fronted section above the Crucible entrance as a stage, the audience tuning into the outdoor scenes on headphones and little details like snipers on the roof make it a genuinely entertaining and immersive experience.

It’s all around you, from the minute the Crucible is evacuated due to ‘fire’ to the moment a young actress hurls a smoke bomb over the heads of the audience.

The real magic, is that they manage to pull off a huge logistical task, and vast outdoor settings, without looking cheap, tacky or lost among the tall city centre buildings.

Sheffield provides a backdrop that money can’t buy, and the cast grace it with an epic and unique performance.